** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1790688
Title:
x86/pti: 32-Bit x86 systems support already available.
Status in linux package in Ubuntu:
Confirmed
Bug description:
Hello.
Linux kernel v4.19 release candidate [1], finally have kernel page-
table isolation ('PTI', previously known as 'KAISER') support for
x86_32 architecture. As we know, 'PTI' provides protection against
attack, known as the "Meltdown" (CVE-2017-5754), that breaks isolation
between user applications and the operating system etc. However,
kernel page-table isolation wasn't available on 32-Bit x86 systems.
Until now.
So, I would like to ask a question: are there any plans to backport
kernel page-table isolation patches for Linux kernels available in
"Trusty"/14.04, "Xenial"/16.04 and "Bionic"/18.04 releases etc.? I
mean x86_32 bit architecture, of course. I'm asking, because it seems,
that pretty much no developers run 32-bit any more. However, there
still are many 32-bit users out there.
For more informations about how 'PTI' was implementing on 32-Bit x86
architecture, plase check - for example - commit '7757d607c6b31'
("x86/pti: Allow CONFIG_PAGE_TABLE_ISOLATION for x86_32"). Here are
messages about 'PTI' support (PATCH v7, v8) for x86_32 [1]. Next,
'PTI' fixes for x86-32 [2] and more patches related to 'x86/mm/pti'
[3]. There is also a short report for the first half of the 4.19
kernel merge window [4].
I'm sorry for such a long message, but I'm very happy that 'PTI'
support is already available for x86_32 architecture and I hope, that
it will be backported to all Ubuntu LTS releases etc.
Thanks, best regards.
______________________
[1] http://lkml.iu.edu/hypermail/linux/kernel/1807.1/03578.html (please see
every next patches etc.)
http://lkml.iu.edu/hypermail/linux/kernel/1807.1/03181.html
http://lkml.iu.edu/hypermail/linux/kernel/1807.2/02790.html
[2] http://lkml.iu.edu/hypermail/linux/kernel/1808.0/05516.html
[3] http://lkml.iu.edu/hypermail/linux/kernel/1807.1/03161.html
[4] https://lwn.net/Articles/762566/ (See "Architecture-specific" changes)
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